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Take viewBox and size of SVG documents into account when merging them

This commit is contained in:
Florian Festi 2017-02-25 16:10:28 +01:00
parent ce87babfdd
commit a81ba48d45
1 changed files with 47 additions and 7 deletions
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54
boxes/svgutil.py
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@ -100,6 +100,40 @@ class SVGFile(object):
else:
raise ValueError("Could not understand SVG file")
unit2mm = {"mm" : 1.0,
"cm" : 10.0,
"in" : 25.4,
"px" : 90.0/25.4,
"pt" : 90.0/25.4/1.25,
"pc" : 90.0/25.4/15,
}
def getSizeInMM(tree):
root = tree.getroot()
m = re.match(r"(\d+\.?\d*)(\D+)", root.get("height"))
height, units = m.groups()
height = float(height) * unit2mm.get(units, 1.0)
m = re.match(r"(\d+\.?\d*)(\D+)", root.get("width"))
width, units = m.groups()
width = float(width) * unit2mm.get(units, 1.0)
return width, height
def getViewBox(tree):
root = tree.getroot()
m = re.match(r"\s*(\d+\.?\d*)\s+"
"(\d+\.?\d*)\s+"
"(\d+\.?\d*)\s+"
"(\d+\.?\d)\s*", root.get("viewBox"))
return [float(m) for m in m.groups()]
def ticksPerMM(tree):
width, height = getSizeInMM(tree)
x1, y1, x2, y2 = getViewBox(tree)
return x2/width, y2/height
def svgMerge(box, inkscape, output):
parser = et.XMLParser(remove_blank_text=True)
@ -108,20 +142,26 @@ def svgMerge(box, inkscape, output):
dest_tree = et.parse(inkscape, parser)
dest_root = dest_tree.getroot()
m = re.match(r"(\d+\.?\d*)(\D+)", dest_root.get("height"))
height, units = m.groups()
src_width, src_height = getSizeInMM(src_tree)
dest_width, dest_height = getSizeInMM(dest_tree)
scale = {"mm" : 1.0,
"pt" : 7.2, # XXX
}.get(units, 1.0)
src_scale_x, src_scale_y = ticksPerMM(src_tree)
dest_scale_x, dest_scale_y = ticksPerMM(dest_tree)
scale_x = dest_scale_x / src_scale_x
scale_y = dest_scale_y / src_scale_y
src_view = getViewBox(src_tree)
off_x = src_view[0] * -scale_x
off_y = (src_view[1]+src_view[3]) * -scale_y + dest_height * scale_y
for el in src_tree.getroot():
import sys
dest_root.append(el)
if el.tag.endswith("g"):
el.set("transform", "matrix(%f,0,0,%f, 0, %i)" % (
scale, scale, -10000+float(height)*scale))
el.set("transform", "matrix(%f,0,0,%f, %f, %f)" % (
scale_x, scale_y, off_x, off_y))
# write the xml file
et.ElementTree(dest_root).write(output, pretty_print=True, encoding='utf-8', xml_declaration=True)